I agree with you. AS Roma had good results when De Rossi took over as coach of As Roma. And it was a little too late to improve their ranking. This is a pretty good result, they managed to get tickets to the European league next season. With one match remaining, it is impossible for As Roma to catch Atalanta. Poor results with 2 draws and 1 defeat meant they failed to overtake Atalanta. On the other hand, Atalanta is playing very well this season. They could even have the opportunity to qualify for the Champions League if they become European champions. So I think Atalanta has the right to play in the champions league next season.
Bro, as I said before Serie A has 5 tickets to the Champions League for grabs and Atalanta already got one ticket because they finished in 5th place. You need to know that Serie A can actually have 6 tickets if Atalanta win the European League and Atalanta finish in 6th place then one ticket will be given to the team that finishes in 5th place, but in this scenario Atalanta is in 5th place, meaning Atalanta has the opportunity to get 2 tickets to the champions league.
This scenario could happen if Atalanta loses the next 2 matches in Serie A and AS Roma won the last match by scoring 9 goals then AS Roma will take 5th place it's just that this scenario is impossible to happen somehow AS Roma scored 9 goals and match-fixing may be applied, obviously both teams will avoid it.
I think you got your analysis wrong on this one because there's no way we're going to have six Italian teams participate in next season's UEFA Champions League competition and I'll explain how. The current UEFA rules allows five Italian teams to represent the league in the UEFA Champions League competition but the truth is that not more than five Italian teams will play in the UEFA Champions League competition no matter where they finish in the league table and who wins the UEFA Europa League competition this season.
If for any reason Roma happens to beat Atalanta to the fifth position of the league table even when we know it's almost impossible and then Atalanta wins the UEFA Europa League final against Bayer Leverkusen, what will happen is that fifth placed team in the league table Roma will not participate again in the UCL but will rather be moved back to the Europa League while Atalanta will join the top four clubs in the league table and play in the UEFA Champions League come next season.